| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| package org.apache.cxf.jaxrs.provider; |
| |
| import java.io.IOException; |
| import java.io.OutputStream; |
| import java.lang.annotation.Annotation; |
| import java.lang.reflect.Type; |
| import java.util.Collections; |
| import java.util.List; |
| |
| import javax.ws.rs.WebApplicationException; |
| import javax.ws.rs.core.MediaType; |
| import javax.ws.rs.core.MultivaluedMap; |
| import javax.ws.rs.ext.MessageBodyWriter; |
| import javax.ws.rs.ext.Provider; |
| |
| import org.apache.cxf.jaxrs.utils.ExceptionUtils; |
| |
| @Provider |
| public class CachingMessageBodyWriter<T> extends AbstractCachingMessageProvider<T> |
| implements MessageBodyWriter<T> { |
| |
| private List<MessageBodyWriter<T>> delegatingWriters; |
| |
| public long getSize(T t, Class<?> type, Type gType, Annotation[] anns, MediaType mediaType) { |
| return -1; |
| } |
| |
| public boolean isWriteable(Class<?> type, Type gType, Annotation[] anns, MediaType mt) { |
| if (delegatingWriters != null) { |
| return getDelegatingWriter(type, gType, anns, mt) != null; |
| } |
| return isProviderKeyNotSet(); |
| } |
| |
| private MessageBodyWriter<T> getDelegatingWriter(Class<?> type, Type gType, Annotation[] anns, MediaType mt) { |
| for (MessageBodyWriter<T> writer: delegatingWriters) { |
| if (writer.isWriteable(type, gType, anns, mt)) { |
| return writer; |
| } |
| } |
| return null; |
| } |
| |
| public void writeTo(T obj, Class<?> type, Type gType, Annotation[] anns, MediaType mt, |
| MultivaluedMap<String, Object> theheaders, OutputStream os) |
| throws IOException, WebApplicationException { |
| this.setObject(obj); |
| getWriter(type, gType, anns, mt).writeTo(getObject(), type, gType, anns, mt, theheaders, os); |
| } |
| |
| |
| protected MessageBodyWriter<T> getWriter(Class<?> type, Type gType, Annotation[] anns, MediaType mt) { |
| if (delegatingWriters != null) { |
| return getDelegatingWriter(type, gType, anns, mt); |
| } |
| MessageBodyWriter<T> w; |
| |
| mc.put(ACTIVE_JAXRS_PROVIDER_KEY, this); |
| try { |
| @SuppressWarnings("unchecked") |
| Class<T> actualType = (Class<T>)type; |
| w = mc.getProviders().getMessageBodyWriter(actualType, gType, anns, mt); |
| } finally { |
| mc.put(ACTIVE_JAXRS_PROVIDER_KEY, null); |
| } |
| |
| if (w == null) { |
| org.apache.cxf.common.i18n.Message message = |
| new org.apache.cxf.common.i18n.Message("NO_MSG_WRITER", BUNDLE, type); |
| LOG.severe(message.toString()); |
| throw ExceptionUtils.toInternalServerErrorException(null, null); |
| } |
| return w; |
| } |
| |
| public void setDelegatingWriter(MessageBodyWriter<T> writer) { |
| this.delegatingWriters = Collections.singletonList(writer); |
| } |
| |
| public void setDelegatingWriters(List<MessageBodyWriter<T>> writers) { |
| this.delegatingWriters = writers; |
| } |
| } |